Pressure-induced superconductivity and Mott transition in spin-liquid κ−(ET)2Cu2(CN)3 probed by C13 NMR
Y. Shimizu, H. Kasahara, T. Furuta, K. Miyagawa, K. Kanoda, M. Maesato, G. Saito
DOI 10.1103/PhysRevB.81.224508 · Physical Review B
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Abstract
Pressure-induced superconductivity and Mott transition in the spin-liquid Mott insulator κ−(ET)2Cu2(CN)3 have been investigated by C13 NMR measurements. The Mott transition from the spin liquid to the Fermi liquid is observed as a sudden decrease in 1/T1T, where T1 is the nuclear-spin-lattice relaxation time. Pseudogap behavior is absent in the Fermi-liquid state, unlike in the metallic phase adjacent to the antiferromagnetic Mott insulator. In the superconducting state, 1/T1 have a cubic temperature dependence with no Hebel-Slichter peak, which is consistent with non-s-wave superconducting pairing.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(ET)2Cu2(CN)3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | 0.4 GPa | onset |
| κ-(ET)2Cu2(CN)3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | unknown |
| κ-(d8-ET)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | unknown |
| κ-(ET)2Cu[N(CN)2]Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | unknown |
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